I saw an early 1970's MB W114 bodied diesel that had a later model, early 80's turbodiesel motor from a 300 transplanted into the engine bay.
the late 60's to early 70's W114 bodied cars, but they are too slow to be practical.
W114 too slow to be practical???
A w114 was the 6 cylinder version of the w115 (diesel or gas with fewer cylinders). Did you perhaps mean w115? People often assume that all w114 were coupes, but there are w114 sedans too. It does happen that all w114/115 coupes were 6 cyl and therefor w114.
In any case, ok, the US 73-76 w114 were only ~130 hp (compared to the same m110 in an injected m110 euro at ~185 hp). So maybe those are slow, but I feel that my 1971 m130 at ~160 hp is no slouch, and I just brought it back from the dead. Keeping up with traffic is no problem.
And other than frankenbenz, there were no factory w114 diesel, all just 6 cyl gas.
Anyway, sorry to go OT, but I felt I had to say something.
My frankenbenz is clearly not what you are seeking, and probably not what your call a frankenbenz, but it is heavily modified, a 1978 450slc 5.0 custom convertible. And here's a pic.
Mach4 has a diesel r107. It gets impressive MPG.
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